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  1. #1
    Senior Member CanadianBiker32's Avatar
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    How to Turn a regular MT Bike to a FAT BIKE

    Is it possible to turn a regular Mt bike into a Fat bike
    or at least change front to FAT BIKE style

    Bigger fork etc?

    But i imagine then bike be riding in an angle

    thoughts on how to make this possible?

  2. #2
    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by CanadianBiker32 View Post
    Is it possible to turn a regular Mt bike into a Fat bike
    or at least change front to FAT BIKE style

    Bigger fork etc?

    But i imagine then bike be riding in an angle

    thoughts on how to make this possible?
    Considering the fork only, it probably wouldn't make much difference to the geometry if the mountain bike were designed for a 100mm fork or greater. A tire with a 4" cross section is about equal to the 100mm travel of the fork. You'd still have the rear tire to contend with, however. The rear isn't going to get the float benefit of the wider tire.
    Last edited by cyccommute; 02-18-14 at 10:08 AM.
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  3. #3
    Lover of Old Chrome Moly Myosmith's Avatar
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    IMHO, not worth it. There are some serious geometry and chainline issues to contend with even if you went as far as to modify the rear triangle. If you just swap forks, without fat tires front and back you'll just end up with an odd-ball frankenbike with no real benefit. I'd just squeeze on the fattest tires your frame will accommodate and ride it that way until you can get a real fat bike. As their popularity grows,there are going to be more used fatbikes and framesets available as well as an increase in the number of manufacturers and variety of price points on new fat bikes.
    Last edited by Myosmith; 02-18-14 at 07:15 AM.
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  4. #4
    ride for a change modernjess's Avatar
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    Quote Originally Posted by Myosmith View Post
    IMHO, not worth it. There are some serious geometry and chainline issues to contend with even if you went as far as to modify the rear triangle. If you just swap forks, without fat tires front and back you'll just end up with an odd-ball frankenbike with no real benefit. I'd just squeeze on the fattest tires your frame will accommodate and ride it that way until you can get a real fat bike. As their popularity grows,there are going to be more used fatbikes and framesets available as well as an increase in the number of manufacturers and variety of price points on new fat bikes.
    +1 this is the proper advice.

  5. #5
    Senior Member scoatw's Avatar
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    I went the poor man's route and bought a used Surly 1x1 and put 2.5 inch tires on it. I could put 3 inch tires on it but they come to close to the stays. But 2.5's do a good enough job in the deep stuff. From what I hear 4 inch tires won't get you thru much deeper.
    Last edited by scoatw; 02-18-14 at 05:28 PM.

  6. #6
    Senior Member rebel1916's Avatar
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    Not even a little bit

  7. #7
    Yup pyze-guy's Avatar
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    You could try a snowcat rim, or similar stlye fat rim, you could go upto about a 3.5 mtb tire at a super low psi. Fatbike website has some info. Would be pricey though.
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    Senior Member rebel1916's Avatar
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    Quote Originally Posted by pyze-guy View Post
    You could try a snowcat rim, or similar stlye fat rim, you could go upto about a 3.5 mtb tire at a super low psi. Fatbike website has some info. Would be pricey though.
    And where is that gonna fit on a "regular" mt bike?

  9. #9
    7-speed doomsday prepper ThermionicScott's Avatar
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    Quote Originally Posted by scoatw View Post
    I went the poor man's route and bought a used Surly 1x1 and put 2.5 inch tires on it. I could put 3 inch tires on it but they come to close to the stays. But 2.5's do a good enough job in the deep stuff. From what I hear 4 inch tires won't get you thru much deeper.
    What's that doohickey under your chainstay? Some kind of chain tensioner?
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  10. #10
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    Quote Originally Posted by scoatw View Post
    I went the poor man's route and bought a used Surly 1x1 and put 2.5 inch tires on it. I could put 3 inch tires on it but they come to close to the stays. But 2.5's do a good enough job in the deep stuff. From what I hear 4 inch tires won't get you thru much deeper.
    I fit 3" tires on my 1x1 with the rigid fork and 35 mm rims. The rear wheel is about 1/2 way back in the dropouts.

  11. #11
    Yup pyze-guy's Avatar
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    Quote Originally Posted by rebel1916 View Post
    And where is that gonna fit on a "regular" mt bike?
    Snowcats rims were build to take standard mtb tires on a "regular" bike and run as low as 5 psi. Super wide profile and grip. So a 2.0-2.5 tire would easily fit. Some bikes might accomadate a larger tire, hence upto.
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  12. #12
    Senior Member rebel1916's Avatar
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    Quote Originally Posted by pyze-guy View Post
    Snowcats rims were build to take standard mtb tires on a "regular" bike and run as low as 5 psi. Super wide profile and grip. So a 2.0-2.5 tire would easily fit. Some bikes might accomadate a larger tire, hence upto.
    Not too many "regular" MTBs gonna fit a 3.5. But OK.

  13. #13
    Sprinter linus's Avatar
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    Try 29er mtb with a fatbike fork. It will work nicely.

  14. #14
    Senior Member scoatw's Avatar
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    Quote Originally Posted by ThermionicScott View Post
    What's that doohickey under your chainstay? Some kind of chain tensioner?
    you are correct sir!

    It's a MRP chain guide and tensioner that cost way too much than its worth. But it does the job.
    Last edited by scoatw; 02-25-14 at 02:01 PM.

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    Senior Member TuckamoreDew's Avatar
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    Quote Originally Posted by CanadianBiker32 View Post
    Is it possible to turn a regular Mt bike into a Fat bike
    or at least change front to FAT BIKE style

    Bigger fork etc?

    But i imagine then bike be riding in an angle

    thoughts on how to make this possible?
    You can see a picture of the fat front conversion in this picture of Gecho's in the winter bike pics thread.

    I was reading an article on the history of fatbikes over at Adventure Cycling and was toying with the idea of trying making a set the old DIY fatbike double rims shown, just for fun, and because it'd be cheap. Not sure what frame I could make them work with, though.

  16. #16
    Senior Member TuckamoreDew's Avatar
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    Quote Originally Posted by Myosmith View Post
    As their popularity grows,there are going to be more used fatbikes and framesets available as well as an increase in the number of manufacturers and variety of price points on new fat bikes.
    This is what I'm waiting for.

  17. #17
    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by linus View Post
    Try 29er mtb with a fatbike fork. It will work nicely.
    You might get enough width for a 3" tire if you used a 26" wheel on the rear. Otherwise, the 29er has the same issue as a 26" wheel bike would have with a 3" tire.
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  18. #18
    Sprinter linus's Avatar
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    Quote Originally Posted by cyccommute View Post
    You might get enough width for a 3" tire if you used a 26" wheel on the rear. Otherwise, the 29er has the same issue as a 26" wheel bike would have with a 3" tire.
    I'm talking about 29er mtb rear and fatbike tire front.

  19. #19
    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by linus View Post
    I'm talking about 29er mtb rear and fatbike tire front.
    I know that. And you'd still have the same issue of fitting a 3" tire into the frame...if you could find a fat bike tire in a 622mm size. You wouldn't gain anything by goint to a 29er but you might if you fitted it with a 26" tire into the 29er frame.
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  20. #20
    Sprinter linus's Avatar
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    Quote Originally Posted by cyccommute View Post
    I know that. And you'd still have the same issue of fitting a 3" tire into the frame...if you could find a fat bike tire in a 622mm size. You wouldn't gain anything by goint to a 29er but you might if you fitted it with a 26" tire into the 29er frame.
    Epic fail.

    I'm talking about regular mtb 29er rear(2.0 or 2.4), the second option by OP. OMG.

  21. #21
    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by linus View Post
    Epic fail.

    I'm talking about regular mtb 29er rear(2.0 or 2.4), the second option by OP. OMG.
    Your fail is far more epic. I know exactly what you are talking about. The point of a fat bike is to have wide tires that float over the snow. How does a 2.0" or 2.5" 29er tire differ from any other mountain bike tire? Does it have special powers because it's, like, bigger?

    Speaking of epic failures, where is this "second option" by CanadianBiker? His one (and only) post in this thread doesn't mention "29er". You are the only person to suggest that a 29er will magically make a mountain bike into a fat bike.
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  22. #22
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    29er in the rear and a fat tire up front should work quite well. Depending on rim / tire both wheels would end up being fairly close in size. My 4.8" tire on a 100mm rim is maybe an inch taller than my 700x35 Marathon winter. A fat front tire adds a lot of stability for winter riding. In soft conditions the back tire will sink and slide around. It probably wouldn't be much more capable than a regular mtb, but if your goal is to feel more comfortable riding in conditions you can already ride on a mtb it should work well.

    It wouldn't be cheap though unless you could find some used parts. New prices are 116-130 for a Salsa / Surly fork, 250-400 for a wheel, and 90-150 for a tire. There are some non-Surly fat components that are cheaper, but I'm not familiar with them. There seems to be a lot of upgrade-itis among fat bike owners, if you check a few bike shops they might be able to connect you with something used.

    Also your bike should probably have a threadless headset, I'm not sure you could find a fork that works with an old quill stem. You'll also have to get a crown race for the fork that is compatible with your current headset.

  23. #23
    Sprinter linus's Avatar
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    Quote Originally Posted by cyccommute View Post
    Your fail is far more epic. I know exactly what you are talking about.
    uh.....No you don't.

    Quote Originally Posted by cyccommute View Post
    The point of a fat bike is to have wide tires that float over the snow. How does a 2.0" or 2.5" 29er tire differ from any other mountain bike tire? Does it have special powers because it's, like, bigger?
    Uh.....fatter, not bigger.


    Quote Originally Posted by cyccommute View Post
    Speaking of epic failures, where is this "second option" by CanadianBiker?
    Quote Originally Posted by CanadianBiker32 View Post
    .....or at least change front to FAT BIKE style......


    Quote Originally Posted by cyccommute View Post
    His one (and only) post in this thread doesn't mention "29er". You are the only person to suggest that a 29er will magically make a mountain bike into a fat bike.
    If you use 29er MTB and fit a fatbike fork, 26 x 4" front tire will be roughly the size of 29er MTB rear wheel. Magic?

  24. #24
    Sprinter linus's Avatar
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    Quote Originally Posted by gecho View Post
    29er in the rear and a fat tire up front should work quite well. Depending on rim / tire both wheels would end up being fairly close in size. My 4.8" tire on a 100mm rim is maybe an inch taller than my 700x35 Marathon winter........
    Thank you. I don't think cyccommute gets it tho.

  25. #25
    Sprinter linus's Avatar
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    To OP.
    This is a great example. I think it looks great as a monstercross bike.

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